IR Echelle Spectrograph – GMTNIRS


The GMT Near-IR spectrometer (GMTNIRS) is a 1.2 – 5 micron echelle optimized for studies of young stellar objects, debris disks, and protoplanetary systems. It will use Silicon immersion gratings to achieve high spectral resolution in a compact format. Using slits well matched to the diffraction-limited image size from a single segment, GMTNIRS will deliver R = 50 – 100k spectra over 5 (JHKLM) atmospheric windows in a single observation. This represents an enormous gain in observing efficiency compared to current spectrographs that sample only a fraction of a band in a single setting.

PI: Dan Jaffe (Univ Texas Austin)

Science Goals

Exoplanets – atmospheric chemistry, internal structure
Stars – formation of stars, disks, and planets, abundances
Nearby galaxies – chemical evolution history and current stellar composition
Distant galaxies – composition of universe in Lyα systems, abundances and evolution

Technical Specifications

Spectral resolution: 50,000 (JHK), 75,000 (LM)
Wavelength range: 1.1 – 5.3 μm
Slit length: 1.2 arcsec


SPIE Proc 7735. Lee, S. et al.